EP1571000A2 - Tintenstrahl-Aufzeichnungsblatt - Google Patents

Tintenstrahl-Aufzeichnungsblatt Download PDF

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Publication number
EP1571000A2
EP1571000A2 EP05004480A EP05004480A EP1571000A2 EP 1571000 A2 EP1571000 A2 EP 1571000A2 EP 05004480 A EP05004480 A EP 05004480A EP 05004480 A EP05004480 A EP 05004480A EP 1571000 A2 EP1571000 A2 EP 1571000A2
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EP
European Patent Office
Prior art keywords
ink
jet recording
recording sheet
ink jet
receiving layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05004480A
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English (en)
French (fr)
Other versions
EP1571000A3 (de
EP1571000B1 (de
Inventor
Hirokazu Sunagawa
Satoshi Matsuura
Rie Teshima
Kazuo Totani
Hidemasa#c/o Seiko Epson Corporation Kanada
Masaya#c/o Seiko Epson Corporation Shibatani
Hiroyuki#c/o Seiko Epson Corporation Onishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
New Oji Paper Co Ltd
Original Assignee
Seiko Epson Corp
Oji Paper Co Ltd
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Publication date
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Publication of EP1571000A2 publication Critical patent/EP1571000A2/de
Publication of EP1571000A3 publication Critical patent/EP1571000A3/de
Application granted granted Critical
Publication of EP1571000B1 publication Critical patent/EP1571000B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0035—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for motor-vehicles
    • B25B27/0042—Tools for removing or replacing filters or for draining oil; Tools for setting or loosening closure means for radiators, batteries, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/506—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/10—Spanners; Wrenches with adjustable jaws
    • B25B13/28—Spanners; Wrenches with adjustable jaws the jaws being pivotally movable
    • B25B13/30—Spanners; Wrenches with adjustable jaws the jaws being pivotally movable by screw or nut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/12—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using magnetic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/508—Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5227—Macromolecular coatings characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5245—Macromolecular coatings characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers

Definitions

  • the present invention relates to ink jet recording sheets and to printed matter using the ink jet recording sheets. More specifically, the present invention relates to an ink jet recording sheet which is excellent in ink jet recording properties including coloring property for dye ink as well as pigment ink, the preservability of a white paper portion, and the degree of brightness on the paper surface. Also, the present invention relates to ink jet recording sheet which does not deteriorate the above-mentioned characteristics even when paper material in which pulp recycled from waste paper is used.
  • Ink jet recording systems in which aqueous ink is ejected through a nozzle having fine pores to form an image on a recording medium is widely used in terminal printers, facsimiles, plotters, sheet feeding printers, etc., due to low noise during recording, ease of performing color recording, possibility of performing high-speed recording, lower cost than other printing devices, and so forth.
  • the aqueous ink may be categorized into dye ink which includes dye and pigment ink which includes pigment, and the dye ink is mainly used due to its clearness.
  • the dye ink since the ink jet recording system is often used for large posters displayed outdoors recently, disadvantages of the dye ink have become conspicuous in that it is easily oxidized by ultraviolet rays, ozone, etc., during long-term exhibition to cause discoloration and deterioration in appearance of the image, and a sufficient light resistance of the printed image cannot be obtained.
  • the pigment ink has advantageous characteristics that it has excellent light resistance, ozone resistance, and water resistance of the printed image, there is a problem in that a clear printed image cannot be obtained using a conventional ink jet recording sheet for dye ink since the particle size of the pigment ink is significantly larger than that of the dye ink.
  • Hei 10-278411 a method in which the surface of an ink receiving layer is controlled to have a certain roughness (for example, refer to Japanese Unexamined Patent Application, First Publication No. 2000-158804), and a method in which pigments having a specific particle size are contained in an ink receiving layer (for example, refer to Japanese Unexamined Patent Application, First Publication No. 2001-270238).
  • the ink jet recording sheet prepared by the methods described in the latter three of the above patent applications do not satisfy both the preservability of white paper portions and the degree of brightness.
  • an object of the present invention includes to provide an ink jet recording sheet having excellent coloring property for both dye ink and pigment ink, and having excellent preservability for white paper portion and the degree of brightness.
  • the present invention provides an ink jet recording sheet having an excellent coloring property and the degree of brightness on the paper surface, which is capable of maintaining excellent preservability for white paper portions, even when pulp recycled from waste paper is used as a paper material.
  • the present invention especially provides a mat type ink jet recording sheet having 60° specular gloss of 15% or less with a small coating amount which satisfies the above-mentioned quality level.
  • the ink jet recording sheet of the present invention includes the following aspects:
  • an ink jet recording sheet having an excellent ink jet recording property (coloring property) for both pigment ink and dye ink, which is capable of clearly printing an image with high precision, and has excellent preservability (especially preventing yellowing due to heat) for white paper portions.
  • an ink jet recording sheet which uses waste paper to effectively utilize limited resources yet having a high degree of brightness of the paper surface, an excellent coloring property, and an improved preservability of white paper portions.
  • the present invention provides an ink jet recording sheet which includes a supporting medium which may be made of pulp; an undercoating layer including, at least, titanium dioxide as pigment, and at least one emulsion type adhesive selected from an acryl copolymer, an ethylene-vinyl acetate copolymer or vinyl acetate copolymer as adhesive; and an ink receiving layer including, at least, silica having an average secondary particle size of 3 to 11 ⁇ m, an adhesive, and a cationic ink fixing agent, the undercoating layer and the ink receiving layer are disposed on at least one surface of the supporting medium.
  • FIG. 1 shows an example of the layer structure of the ink jet recording sheet according to the present invention.
  • an ink receiving layer 16 is disposed on one surface of a paper supporting medium 12 via an undercoating layer 14.
  • each of the undercoating layer and the ink receiving layer may be formed by a plurality of layers.
  • the ink receiving layer is located furthermost with respect to the paper supporting medium and the undercoating layer.
  • an overcoating layer may be provided on the ink receiving layer in order to give glossiness or to improve the preservability, within a range not deteriorating the recording properties of the ink receiving layer.
  • Examples of the pulp which may be used as the main component of the paper supporting medium include: chemical pulp, such as L-bleached kraft pulp (LBKP) and N-bleached kraft pulp (NBKP); mechanical pulp, such as groundwood pulp (GP) and thermomechanical pulp (TMP); and pulp recycled from waste paper. These pulp may be used alone or in a mixture of two or more. Among these, it is preferable to use the LBKP as the main component of the pulp. Also, although the beating degree thereof is not particularly limited, it is preferable to beat until the freeness thereof reaches about 200 to 500 ml (CSF: JIS-P-8121). If the beating degree is too small, cockling when printed tend to occur and uneven absorption of ink tends to be readily caused. If the beating degree is too large, on the other hand, smoothness tends not to be obtained.
  • chemical pulp such as L-bleached kraft pulp (LBKP) and N-bleached kraft pulp (NBKP)
  • mechanical pulp such as groundwood pulp (
  • the ink jet recording sheet according to the present invention includes an undercoating layer which has certain materials, it becomes possible to obtain an ink jet recording sheet having an excellent preservability for white paper portions and a high degree of brightness even when pulp recycled from waste paper or mechanical pulp, which are generally avoided in use for ink jet recording sheets, is utilized for the paper supporting medium.
  • Waste paper may be used and resources may be effectively utilized by employing 10% by mass or more of pulp recycled from waste paper in 100% by mass of pulp used for machining paper supporting medium. According to the present invention, the degree of brightness and preservability of white paper portion become excellent even when 10 to 100% by mass of pulp is recycled from waste paper.
  • Examples of the source of waste paper, which is eventually formed as pulp, include newspaper, magazines, paperboard, sealing paper, corrugated fiberboard, and printed matter. Also, broke woodfree paper, coated paper, etc., which may be produced during the production thereof may be included in the waste paper.
  • Pulp may be generally recycled from waste paper by subjecting waste paper and/or broken paper to, for example, a breaking process using a low concentration or high concentration pulper, a rough selection and well selection process using a screen or cleaner, a deinking process using flotation of water washing method, and a bleaching process using chlorine, chlorine dioxide, sodium hypochlorite, oxygen, etc., with a proper combination thereof.
  • filler in the paper material.
  • the filler may be added to adjust air permeability, to impart opacity, and to adjust ink absorption of the paper material.
  • examples of the filler include clay, kaolin, sintered kaolin, talc, calcium carbonate, magnesium carbonate, aluminum hydroxide, silica, titanium oxide, zeolite, and so forth.
  • calcium carbonate is preferable because a paper material having high degree of brightness may be obtained by using it.
  • filler 1 to 35 parts by weight of filler be contained with respect to 100 parts of the pulp. If the amount of filler is too small, not only will the level of brightness be lowered but also the absorption of ink tends to be decreased. If the amount of filler is too large, the rigidity and strength of paper tends to be reduced. Note that an addition of too large an amount of calcium carbonate may be a cause of yellowing of ink jet recording sheets.
  • machining paper it is possible to add various additives for machining paper, if necessary, such as conventionally used anionic, nonionic, cationic or amphoteric retention aids, freeness improvers, paper strength improvers, and sizing agents, to a paper material containing the above-mentioned pulp and filler within an amount range which does not deteriorate the effect of the present invention.
  • additives for machining papers if necessary, such as a dye, pH adjusting agent, antifoaming agent, pitch controlling agent, and slime controlling agent.
  • a dye such as a dye, pH adjusting agent, antifoaming agent, pitch controlling agent, and slime controlling agent.
  • the preservability of white paper portion may be lowered.
  • a machining method for paper is not particularly limited, and may be performed by using known machining devices, such as a Fourdrinier paper machine, cylinder paper machine, and twin-wire paper machine.
  • Paper produced may be categorized into acidic paper and neutral paper depending on pH of the paper material, and neutral paper may be suitably used as a paper supporting medium according to the present invention from the viewpoint of long-term preservability.
  • the basis weight of the paper supporting medium is not particularly limited, it is generally about 20 to 400 g/m 2 .
  • the undercoating layer includes titanium dioxide as pigment, and at least one emulsion type adhesive selected from acryl type polymer, ethylene-vinyl acetate copolymer and vinyl acetate polymer as adhesive.
  • Titanium dioxide may be categorized into rutile type and anatase type depending on the differences of the structure. Although a higher degree of brightness is generally obtained from the rutile type, both may be effectively used according to the present invention.
  • the secondary particle size of titanium dioxide is preferably 0.1 ⁇ m to 2 ⁇ m, and more preferably 0.3 ⁇ m to 1 ⁇ m. If the particle size is too small, strength, ink absorptivity and coloring property tend to be decreased. If the particle size is too large, on the other hand, clearness of image tends to be decreased and a smooth and uniform surface may not be obtained.
  • silica is known as pigment which may be used for an ink jet recording paper
  • the permeability of silica for light, water, and gas is high as compared with other pigments. Accordingly, if an ink receiving layer is directly formed on a paper supporting medium which is formed by using pulp recycled from waste paper, the degree of brightness of such paper becomes low and a clear image cannot be printed due to the low degree of brightness. Even if an undercoating layer which includes silica as its main constituent is formed between a paper supporting medium and an ink receiving layer, a sufficient degree of brightness cannot be obtained.
  • the preservability of the white paper portion may be lowered.
  • the reason for this may be considered that the cationic ink fixing agent included in the ink receiving layer is oxidized because calcium carbonate and the fluorescent brightener, which is a stilbene derivative, are alkali compounds, and this oxidation enhances the yellowing on the surface of the ink jet recording sheet.
  • the photo diffusion property of titanium dioxide is high and it does not cause oxidation of a cationic ink fixing agent, the degree of brightness and the preservability of white paper portion of an ink jet recording sheet are considered to be improved by forming an undercoating layer using titanium dioxide as pigment.
  • titanium dioxide is combined with at least one emulsion type adhesive selected from an acryl polymer, ethylene-vinyl acetate copolymer, or vinyl acetate as adhesive and used.
  • emulsion type adhesive selected from an acryl polymer, ethylene-vinyl acetate copolymer, or vinyl acetate as adhesive and used.
  • An ink jet recording sheet having a high degree of brightness and whose preservability of white paper portion tends not to be lowered as explained above may be obtained by using titanium dioxide as pigment in comparison with a case where other pigments, such as kaolin, precipitated calcium carbonate and talc, are used. Also, the amount of a binder (amount of adhesive) may be reduced by using titanium dioxide in combination with the above-mentioned adhesive(s).
  • the ink absorptivity of the undercoating layer (mainly absorptivity of solvent of ink) may increase by decreasing the amount of binder in the undercoating layer, and it becomes possible to print clear images with high fineness on the obtained ink jet recording sheet. Also, the decreasing of amount of binder may contribute to the improvement of the degree of brightness.
  • Examples of the acryl polymer used in the emulsion type adhesive for the undercoating layer include polymers which have acrylic units, such as acrylic acid, methacrylic acid, acrylate and methacrylate.
  • the acryl polymer may be a homopolymer including (meth)acryl unit, copolymer, or copolymer including other structural units.
  • Examples of the acryl polymer include polymethyl (meth)acrylate.
  • ethylene-vinyl acetate copolymer examples include copolymers which include ethylene and vinyl acetate as main constituents and other polymers, for example, (meth)acrylate, such as 2-ethylhexyl acrylate, vinyl fatty acid other than vinyl acetate like vinyl barsetate, and monomers which include a functional group like acrylic acid.
  • (meth)acrylate such as 2-ethylhexyl acrylate
  • vinyl fatty acid other than vinyl acetate like vinyl barsetate examples include a functional group like acrylic acid.
  • Examples of the vinyl acetate polymer include one which has a vinyl acetate unit and polyvinyl acetate is preferable.
  • titanium dioxide and at least one emulsion type adhesive selected from acryl polymers, ethylene-vinyl acetate copolymers, or vinyl acetate polymers it becomes possible to obtain an ink jet recording sheet having a high degree of brightness, excellent preservability for white paper portions, and high print concentration.
  • the ratio of the amount of each of the above components is preferably 2 to 30 parts by weight, more preferably 5 to 20 parts by weight, of adhesive with respect to 100 parts by weight of titanium dioxide. If the amount of adhesive is too small, the strength of the undercoating layer will be reduced, and if the amount of adhesive is too large, ink absorptivity, coloring pmperty, and the degree of brightness will be deteriorated.
  • inorganic pigments examples include silica, calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, aluminum hydroxide, alumina, pseudoboehmite, lithopone, zeolite, hydrated halloysite, magnesium carbonate, and magnesium hydroxide.
  • the amount thereof be adjusted to be 70% by mass or greater with respect to the total of 100% by mass of the inorganic pigments and titanium dioxide.
  • the adhesive include: proteins, such as casein, soy bean protein and synthesized protein; various starches, such as ordinary starch and oxidized starch; polyvinyl alcohols and derivatives thereof; cellulose derivatives, such as carboxymethyl cellulose and methyl cellulose; and conjugated diene type resins, such as a styrene-butadiene resin and methyl methacrylate-butadiene resin.
  • auxiliary agents which are generally used for producing coated paper, in a suitable amount, to the undercoating layer, such as a thickener, an antifoamer, a wetting agent, a coloring agent, a fluorescent brightener, a fluorescent pigment, an antistatic agent, a light resistance auxiliary agent, an UV absorber, an antioxidizing agent, and an antiseptic agent.
  • the undercoating layer may be formed by applying an undercoating layer coating solution which includes the above-mentioned pigment, adhesive, and inorganic pigment, etc., if necessary, onto the surface of a paper supporting medium, and drying the coating solution.
  • the coating amount, in terms of solid components, of the undercoating layer is above 3 to 20 g/m 2 , preferably 5 to 15 g/m 2 , and more preferably 7 to 13 g/m 2 . If the coating amount is too small, a high degree of brightness cannot be obtained and the yellowing phenomenon tends to be easily generated. If the coating amount is too large, on the other hand, not only is the effect of the present invention saturated, but also the strength between the layers will be weakened.
  • the undercoating layer may be formed by using various known application devices, such as a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a rod blade coater, a lip coater, a curtain coater, and a die coater. It is possible, after the coating process, to carry out a finishing process using a calender device, such as a machine calender, a TG calender, a super calender, and a soft calender.
  • a calender device such as a machine calender, a TG calender, a super calender, and a soft calender.
  • the ink receiving layer at least includes silica having an average secondary particle size of 3 to 11 ⁇ m, an adhesive, and a cationic ink fixing agent.
  • silica use of amorphous silica is preferable.
  • Methods for producing the silica are not particularly limited, and it may be produced by using an arc method, a dry method, a wet method (precipitation method, gel method), and so forth.
  • the wet method is preferable since the silica produced by the wet method is suitable for the ink jet recording sheet for pigment ink as well as the ink jet recording sheet for dye ink.
  • the average particle size of the secondary particle of silica be 3 to 11 ⁇ m, and it is more preferable that the average particle size of the secondary particle of silica be 4 to 10 ⁇ m. If the average particle size is less than 3 ⁇ m, the absorptivity for dye ink of the ink jet recording sheet which includes such silica tends to be reduced. Also, since the light transmittance thereof will increase, the light resistance of an image formed by dye ink as well as the coating strength tends to be reduced. Moreover, when this is used for ink jet recording sheet for pigment ink, disadvantages such as lowering in the fixation property of the pigment ink will occur.
  • the average particle size of the secondary particle of the silica exceeds 11 ⁇ m, on the other hand, problems tend to occur for the ink jet recording sheet for dye ink as well as for the ink jet recording sheet for pigment ink, such as lowering in clearness of image due to low print concentration and the generation of blurring of image due to surface roughness.
  • the "average secondary particle size of silica" in this application is measured by using a call counter method, and it indicates a volume average particle size measured by using a sample of silica which is ultrasonically dispersed in distilled water for 30 seconds.
  • the oil absorption of silica based on JIS K-5101 is preferably 210 to 250 cm 3 /100 g since such silica has excellent coloring property when recorded using dye ink as well as pigment ink.
  • the surface of at least a part of silica contained in the ink receiving layer be treated with a surfactant (hereinafter also referred to as surface treated silica). That is, the surface of all of the silica may be treated with a surfactant, or it is possible to use the surface treated silica with untreated silica.
  • a surfactant hereinafter also referred to as surface treated silica.
  • the untreated silica is the same as those explained above, and hence the explanation thereof will be omitted.
  • silica whose surface is treated with a surfactant, those which have been explained above may be utilized.
  • Examples of a surfactant which may be used for treating the surface of silica include nonionic surfactant, cationic surfactant, anionic surfactant, amphoteric surfactant, and so forth. Among these, it is preferable to use nonionic surfactant.
  • Examples of the nonionic surfactant include polyoxycthylenealkyl ether, polyoxyethylenepolyoxypropylene copolymer, and polyoxyethylenepolyoxypropylenealkyl ether.
  • HLB hydrophile-lipophile balance
  • a method for treating the surface of silica using a surfactant one which is described in, for example, Japanese Unexamined Patent Application, First Publication No. Hei 9-25440 may be adopted. That is, a dry mixing method may be adopted in which silica, for example, wet type silica, and a surfactant, for example, polychain type nonionic surfactant, are mixed using a mixer, such as a high-speed stream mixer. In such a case, it is possible to add a surfactant directly to silica, and it is also possible to add a surfactant which is diluted with a volatile solvent, such as ethanol, to silica and to mix them.
  • a volatile solvent such as ethanol
  • a wet treatment method in which a predetermined amount of a surfactant, for example, a nonionic surfactant is added and mixed with an emulsion slurry solution of silica, for example, wet type silica, and a spray-drying process is subsequently carried out.
  • a surfactant for example, a nonionic surfactant
  • silica for example, wet type silica
  • spray-drying process subsequently carried out.
  • the surfactant is insoluble with water
  • the surface of the silica which is treated by a surfactant using the method described above is considered to be covered by the surfactant.
  • the amount of surfactant added is preferably 0.1 to 30 parts, more preferably 0.5 to 20 parts, with respect to 100 parts of silica.
  • silica which is covered by the surfactant within the above-mentioned range is included, it becomes possible to improve the coloring property and to obtain a clear image.
  • Adhesives used in the ink receiving layer are not particularly limited, and examples thereof include conventionally known adhesives generally used for ink jet recording, such as water soluble adhesives like starch and polyvinyl alcohol, acryl polymers, ethylene-vinyl acetate copolymers, vinyl acetate polymers, urethane type polymers, styrene-butadiene copolymers, and emulsion type adhesives thereof. These adhesives may be used alone or in a mixture of two or more.
  • an emulsion type adhesive of acryl polymer is preferable.
  • the acryl polymer include polymers which include acryl unit, such as acrylic acid, methacrylic acid, acrylate and methacrylate.
  • the acryl polymer may be a homopolymer of (meth)aerylic unit or may be a copolymer which may include other structural unit(s).
  • Examples of the acryl polymer include polymethyl(meth)acrylate.
  • polyvinyl alcohol together with the emulsion type adhesive of acryl polymer since the adhesiveness with a pigment will become excellent in this manner.
  • polyvinyl alcohol derivatives of polyvinyl alcohol, such as silanol denatured polyvinyl alcohol and cationized polyvinyl alcohol, may also be suitably used.
  • the ratio thereof is preferably within the range of 1 : 10 to 2 : 1, more preferably 1 : 5 to 1 : 1.
  • the content of the acryl polymer is preferably 1 to 50 parts by mass, more preferably 5 to 40 parts by mass, with respect to 100 parts by mass of silica.
  • emulsion type adhesives typically used for an ink jet recording sheet for instance, ethylene-vinyl acetate copolymer, vinyl acetate polymer, urethane polymer, and styrene-butadicne copolymer, are all inferior to the acryl copolymer from the viewpoint or print coloring property, and urethane polymer and styrene-butadiene copolymer have problems that the yellowing of white paper portion tends to be readily generated and the preservability is not good.
  • the cationic ink fixing agent used in the ink receiving layer in not particularly limited, and examples thereof include commercially available:
  • a cationic ink fixing agent it is preferable, as a cationic ink fixing agent, to use dicyandiamide-polyethylene amine copolymer with acrylamide-diallylamine copolymer.
  • the combination is preferable because by using the dicyandiamide-polyethylene amine copolymer with the acrylamide-diallylamine copolymer, the coloring property when recorded using pigment ink as well as dye ink will be improved and the preservability of portions printed by using dye ink will be enhanced.
  • the amount of the cationic ink fixing agent is preferably 5 to 60 parts by mass, more preferably 20 to 50 parts by mass, with respect to 100 parts by mass of silica. If the amount of the cationic ink fixing agent is less than 5 parts by mass, the coloring property of images and the preservability of printed portion will be easily deteriorated. If the amount of the cationic polymer exceeds 60 parts by mass, on the other hand, the ink absorptivity and the clearness of image will be deteriorated and uneven color will be easily caused.
  • auxiliary agents which are generally used for producing coated paper, in a suitable amount, to the ink receiving layer, such as a thickener, an antifoamer, a wetting agent, a surfactant, a coloring agent, an antistatic agent, a light resistance auxiliary agent, an UV absorber, an antioxidizing agent, and an antiseptic agent.
  • an ink jet recording sheet of the present invention a high degree of brightness may be realized even if an ink receiving layer does not substantially contain a fluorescent brightener.
  • Such an ink receiving layer may be formed by applying an ink receiving layer coating solution which includes the above-mentioned silica, adhesive, cationic ink fixing agent, and auxiliary agent if necessary, onto the surface of an undercoating layer, which is formed on a paper supporting medium, and drying the coating solution.
  • an ink receiving layer coating solution which includes the above-mentioned silica, adhesive, cationic ink fixing agent, and auxiliary agent if necessary
  • the coating amount of the ink receiving layer is not particularly limited, it is preferably 2 to 30 g/m 2 , and more preferably 5 to 20 g/m 2 . If the coating amount is smaller than the above-mentioned lower limit, the ink absorptivity, clearness of image, and print preservability tend to be easily lowered, and if the coating amount is larger than the above-mentioned upper limit, on the other hand, the strength of coating film and clearness of image tend to be easily lowered.
  • the ink receiving layer may be formed of a plurality of layers as described above, and in such case, the compositions of each layer may be different from each other.
  • the ink receiving layer may be formed by using various known application devices, such as a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a rod blade coater, a lip coater, a curtain coater, and a die coater. It is possible, after the coating process, to carry out a finishing process using a calender device, such as a machine calender, a super calender, and a soft calender.
  • a calender device such as a machine calender, a super calender, and a soft calender.
  • Print matter may be produced by printing the ink jet recording sheet explained above with dye ink or pigment ink using a printing device, such as a printer.
  • Precipitated calcium carbonate (20 parts) was added to a slurry of 100 parts of L-bleached kraft pulp (freeness 400 ml CSF), and 1 part of cation starch (a product of Oji Cornstarch Co., Lid., product name: Ace K) and 0.2 parts of alkenylsuccinic anhydride type neutral sizing agent (a product of National Starch and Chemical Co., Ltd., product name:
  • An undercoating layer coating solution A was prepared by dispersing 100 parts of titanium dioxide (a product of Sakai Chemical Industry Co. Ltd., product name: R-21, secondary particle size of 0.5 ⁇ m, rutile type) as pigment, 10 parts of an acryl polymer (a product of Rohm and Haas, product name: Primal P-376, emulsion type adhesive) and 5 parts of oxidized starch (a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive) as adhesive in water.
  • titanium dioxide a product of Sakai Chemical Industry Co. Ltd., product name: R-21, secondary particle size of 0.5 ⁇ m, rutile type
  • an acryl polymer a product of Rohm and Haas, product name: Primal P-376, emulsion type adhesive
  • oxidized starch a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive
  • An ink receiving layer coating solution A was prepared by dispersing 100 parts of wet silica (a product of Tokuyama Corporation, product name: Finesil X-60) as pigment, 20 parts of silyl denatured polyvinyl alcohol (a product of Kuraray Co. Ltd., product name: R-1130) and 20 parts of an acryl polymer (a product of Rohm and Haas, product name:
  • the undercoating layer coating solution A was applied onto the paper supporting medium A so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution A was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • Precipitated calcium carbonate (20 parts) was added to a mixed slurry including 70 parts of L-bleached kraft pulp (freeness: 400 ml CSF) and 30 parts of pulp obtained by subjecting waste newspaper to a deinking process (freeness: 250 ml), and 1 part of cation starch (a product of Oji Cornstarch Co., Ltd., product name: Ace K) and 0.2 parts of alkenylsuccinic anhydride type neutral sizing agent (a product of National Starch and Chemical Co., Ltd., product name: Phibrun 81K) were added, sufficiently mixed, and paper raw material was obtained. This was dried using a Fourdrinier multi-cylinder paper machine until the water content thereof became 10%. Then, 7% solution including oxidized starch was applied to both sides thereof in an amount of 4 g/m 2 using a size press, and this was dried until water components thereof became 7% to produce a paper supporting medium B of 200 g/m 2 .
  • cation starch
  • An ink jet recording sheet was obtained in the same manner as in Example 1 except that the paper supporting medium A in Example 1 was changed to the paper supporting medium B.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • Precipitated calcium carbonate (20 parts) was added to a mixed slurry including 70 parts of L-bleached kraft pulp (freeness: 400 ml CSF) and 30 parts of pulp obtained by subjecting waste colored paper (including colored woodfree paper and art paper) to a deinking process (freeness: 250 ml), and 1 part of cation starch (a product of Oji Cornstarch Co., Ltd., product name: Ace K) and 0.2 parts of alkenylsuccinic anhydride type neutral sizing agent (a product of National Starch and Chemical Co., Ltd., product name: Phibrun 81K) were added, sufficiently mixed, and paper raw material was obtained.
  • cation starch a product of Oji Cornstarch Co., Ltd., product name: Ace K
  • alkenylsuccinic anhydride type neutral sizing agent a product of National Starch and Chemical Co., Ltd., product name: Phibrun 81K
  • An ink jet recording sheet was obtained in the same manner as in Example 1 except that the paper supporting medium A in Example 1 was changed to the paper supporting medium C.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • Precipitated calcium carbonate (20 parts) was added to a mixed slurry including 70 parts of L-bleached kraft pulp (freeness: 400 ml CSF) and 30 parts of pulp obtained by subjecting waste woodfree white paper (the term includes white unprinted portion of woodfree paper of binder's waste and broke generated during a binding process, printing process, etc.) to a defiberizing process (freeness: 250 ml), and 1 part of cation starch (a product of Oji Cornstarch Co., Ltd., product name: Ace K) and 0.2 parts of alkenylsuccinic anhydride type neutral sizing agent (a product of National Starch and Chemical Co., Ltd., product name: Phibrun 81K) were added, sufficiently mixed, and paper raw material was obtained.
  • waste woodfree white paper the term includes white unprinted portion of woodfree paper of binder's waste and broke generated during a binding process, printing process, etc.
  • defiberizing process freeness: 250 ml
  • Example 2 An ink jet recording sheet was obtained in the same manner as in Example 1 except that the paper supporting medium A in Example 1 was changed to the paper supporting medium D.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%,
  • An undercoating layer coating solution B was prepared by dispersing 100 parts of titanium dioxide (a product of Sakai Chemical Industry Co. Ltd., product name: R-21, secondary particle size of 0.5 ⁇ m, rutile type) as pigment, 10 parts of an ethylene-vinyl acetate copolymer (a product of Showa Highpolymer Co. Ltd., product name: Polysol AM-3000, an emulsion type adhesive) and 5 parts of oxidized starch (a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive) as adhesive in water.
  • titanium dioxide a product of Sakai Chemical Industry Co. Ltd., product name: R-21, secondary particle size of 0.5 ⁇ m, rutile type
  • an ethylene-vinyl acetate copolymer a product of Showa Highpolymer Co. Ltd., product name: Polysol AM-3000, an emulsion type adhesive
  • oxidized starch a product of Oji Cornstarch Co., Ltd
  • the undercoating layer coating solution B was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution A was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • An undercoating layer coating solution C was prepared by dispersing 100 parts of titanium dioxide (a product of Sakai Chemical Industry Co. Ltd., product name: R-21, secondary particle size of 0.5 ⁇ m, rutile type) as pigment, 10 parts of a vinyl acetate polymer (a product of Nissin Chemical Industry Co., Ltd., product name: Vinyblan 1080, an emulsion type adhesive) and 5 parts of oxidized starch (a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive) as adhesive in water.
  • titanium dioxide a product of Sakai Chemical Industry Co. Ltd., product name: R-21, secondary particle size of 0.5 ⁇ m, rutile type
  • a vinyl acetate polymer a product of Nissin Chemical Industry Co., Ltd., product name: Vinyblan 1080, an emulsion type adhesive
  • oxidized starch a product of Oji Cornstarch Co., Ltd, product name: Ace A,
  • the undercoating layer coating solution C was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution A was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • wet silica (900 g, a product of Tokuyama Corporation, product name: Finesil X-60) was suspended in water to obtain a slurry (about 10 to 15%), and 100 g of a water-suspension of a surfactant (polyoxyethylenelauryl ether, a product of Dai-ichi Kogyo Sciyaku Co. Ltd., product name: Noigen ET-102, HLB: 10.8) was added to the slurry. The mixture was stirred for one hour, spray-dried, pulverised, and classified to obtain the surface treated silica. The average secondary particle size of the obtained surface treated silica was 6 ⁇ m.
  • a surfactant polyoxyethylenelauryl ether, a product of Dai-ichi Kogyo Sciyaku Co. Ltd., product name: Noigen ET-102, HLB: 10.8
  • wet silica 80 parts, a product of Tokuyama Corporation, product name: Finesil X-60, secondary particle size of 6.2 ⁇ m
  • silyl denatured polyvinyl alcohol 20 parts, a product of Kuraray Co. Ltd., product name: R-1130
  • an acryl polymer a product of Rohm and Haas, product name: Primal P-376
  • acrylamide-diallyl amine copolymer 15 parts, a product of Sumitomo Chemical Co. Ltd., product name: SR 1001
  • dicyandiamide-polyethylene amine copolymer 15 parts, a product of Nicca Chemical Co. Ltd., product name: Neofix U-117) as ink fixing agents were dispersed in water to obtain the ink receiving layer coating solution B.
  • the undercoating layer coating solution A was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution B was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • wet silica 80 parts, a product of Tokuyama Corporation, product name: Finesil X-60, secondary particle size of 6.2 ⁇ m
  • silyl denatured polyvinyl alcohol 20 parts, a product of Kuraray Co. Ltd., product name: R-1130
  • an acryl polymer a product of Rohm and Haas, product name: Primal P-376
  • acrylamide-diallyl amine copolymer 25 parts, a product of Sumitomo Chemical Co. Ltd., product name: SR 1001
  • dicyandiamide-polyethylene amine copolymer 5 parts, a product of Nicca Chemical Co. Ltd., product name: Neofix IJ-117) as ink fixing agents were dispersed in water to obtain the ink receiving layer coating solution C.
  • the undercoating layer coating solution A was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution C was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • the undercoating layer coating solution A was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and dried to obtain an ink jet recording sheet having no undercoating layer.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • Wet silica 100 parts, a product of Tokuyama Corporation, product name: Finesil X-60, secondary particle size of 6.2 ⁇ m
  • an acryl polymer a product of Rohm and Haas, product name: Primal P-376, an emulsion type adhesive
  • 5 parts of oxidized starch a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive
  • the undercoating layer coating solution D was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution A was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • wet silica 100 parts, a product of Tokuyama Corporation, product name: Finesil X-60, secondary particle size of 6.2 ⁇ m
  • 20 parts of silyl denatured polyvinyl alcohol (a product of Kuraray Co. Ltd., product name: R-1130) and 20 parts of an acryl polymer (a product of Rohm and Haas, product name: Primal P-376, an emulsion type adhesive) as adhesive
  • 30 parts of polydiallyldimethylammonium chloride (a product of Senka Co. Ltd., product name: Unisence CP101) as ink fixing agent were dispersed in water to obtain the ink receiving layer coating solution D.
  • the undercoating layer coating solution D was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution D was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • Calcium carbonate 100 parts, a product of Okutama Kogyo Co., Ltd., product name: TP-121, shape: spindle, standard particle size of 0.5 ⁇ 1.5 ⁇ m
  • an acryl polymer a product of Rohm and Haas, product name: Primal P-376, an emulsion type adhesive
  • 5 parts of oxidized starch a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive
  • the undercoating layer coating solution E was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution A was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • Titanium dioxide 100 parts, a product of Sakai Chemical Industry Co. Ltd., product name: R-21, secondary particle size of 0.5 ⁇ m, rutile type) as pigment, 10 parts of styrene-butadiene rubber (SBR) (a product of JSR Co., Ltd., product name: 0589, Tg : 0°C, an emulsion type adhesive) and 5 parts of oxidized starch (a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive) as adhesive were dispersed in water to obtain the undercoating layer coating solution F.
  • SBR styrene-butadiene rubber
  • oxidized starch a product of Oji Cornstarch Co., Ltd, product name: Ace A, a water soluble adhesive
  • the undercoating layer coating solution F was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution A was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • the undercoating layer coating solution A was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution E was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 4%.
  • the undercoating layer coating solution A was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution F was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 3%.
  • wet silica 100 parts, a product of Tokuyama Corporation, product name: Finesil X-60, secondary particle size of 6.2 ⁇ m, oil absorption amount of 240 cm 3 /100 g
  • 20 parts of silyl denatured polyvinyl alcohol a product of Kuraray Co. Ltd., product name: R-1130
  • an acryl polymer a product of Rohm and Haas, product name: Primal P-376, an emulsion type adhesive
  • 15 parts of acrylamide-diallyl amine copolymer 15 parts of Sumitomo Chemical Co.
  • the undercoating layer coating solution A was applied onto the paper supporting medium B so that the coating amount became 10 g/m 2 , and after the coating solution was dried, the ink receiving layer coating solution G was applied thereon so that the coating amount became 10 g/m 2 . This was dried to obtain an ink jet recording sheet.
  • the 60° specular surface gloss of a white paper portion in the ink receiving layer of the obtained ink jet recording sheet based on JIS-Z8741 was 4%. Evaluation:
  • the degree of brightness at a white paper portion of an ink receiving layer side of the ink jet recording sheet of each Example and Comparative Example was measured in accordance with a method defined in JIS-P8123.
  • the ink jet recording sheet of each Example and Comparative Example was left for one week under an environment of 80°C and 50% humidity.
  • the preservability (yellowing resistance against heat) of white paper portion was evaluated based on the criteria described below:
  • the ink jet recording sheet of each Example and Comparative Example was irradiated by a xenon lamp (100,000 lux) for three days under an environment of 60°C and 50% humidity.
  • the preservability (yellowing resistance against light) of white paper portion was evaluated based on the criteria described below:
  • the ink jet recording sheet of each Example and Comparative Example was left for 24 hours in an atmosphere in which the concentration of ozone was 10 ppm under an environment of 24°C and 60% humidity.
  • the preservability (yellowing resistance against ozone) of white paper portion was evaluated based on the criteria described below:
  • the best black tone portion of a printed matter printed by using the pigment ink jet printer (a product of SEIKO EPSON Corporation, trade name: PM-4000PX; ink: Mat black; print mode: Fotomat paper / high fineness) was rubbed by a finger 24 hours after the printing, and evaluated as follows:
  • Printed matter obtained by using the dye ink jet printer (a product of SEIKO EPSON Corporation, trade name: PM-G800; print mode: Fotomat paper / high fineness) in which the magenta print concentration was adjusted to be 1.0, was irradiated with a fluorescent lamp having illuminance of 70 klux under the conditions of 24°C and 60% RH for 500 hours and the print concentration thereof was measured. Note that a glass having a thickness of 2 mm was placed on the printed matter.
  • the preservability (light resistance) of the printed portion was evaluated based on the following criteria:
  • Printed matter obtained by using the dye ink jet printer (a product of SEIKO EPSON Corporation, trade name; PM-G800; print mode: Fotomat paper / high fineness) in which the magenta print concentration was adjusted to be 1.0, was left for 24 hours in an atmosphere in which the concentration of ozone was 10 ppm under an environment of 24°C and 60% humidity. After this, the print concentration thereof was measured.
  • the preservability (ozone resistance) of the printed portion was evaluated based on the following criteria:
  • Characters of 30 points were printed by using the dye ink jet printer (a product of SEIKO EPSON Corporation, trade name: PM-G800; print mode: Fotomat paper / high fineness) at the best black concentration. Then, a water drop was placed on the characters and naturally dried. The preservability (water resistance) of the printed portion was evaluated based on the following criteria:
  • the undercoating layer includes titanium dioxide as pigment and at least one emulsion type adhesive selected from acryl polymers, ethylene-vinyl acetate copolymers, or vinyl acetate polymers as the adhesive
  • the ink receiving layer includes silica having an average secondary particle size of 3 to 11 ⁇ m as pigment and a cationic ink fixing agent, have an excellent degree of brightness, superb preservability for white paper portions as well as printed portions, and excellent coloring property for dye ink as well as pigment ink. Also, it becomes clear that the excellent properties thereof may be maintained even if pulp recycled from various kinds of waste paper is used for the paper supporting medium in consideration of the environmental protection.
  • silica or calcium carbonate was used as pigment for the undercoating layer, or SBR was used as adhesive for the undercoating layer, or a fluorescent brightener was used for the ink receiving layer, significant deterioration of the preservability for white paper portions was observed, Also, when the average particle size of silica for the ink receiving layer was less than 3 ⁇ m or larger than 11 ⁇ m, reduction of ink absorptivity and ink fixation was observed and the coloring property was significantly deteriorated.

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WO2010012365A3 (en) * 2008-08-01 2010-04-01 M-Real Oyj White, brilliant white and coloured transparent papers comprising secondary or postconsumer waste fibres (pcw fibres) in proportions up to 100%
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EP3395913A4 (de) * 2015-12-23 2018-12-12 LG Hausys, Ltd. Tintenaufnahmeschichtzusammensetzung mit ausgezeichneten druckeigenschaften für dekoratives element, dekoratives element und verfahren zur herstellung eines dekorativen elements
US10933678B2 (en) 2015-12-23 2021-03-02 Lg Hausys, Ltd. Ink-receiving layer composition having excellent printing characteristics for decorative member, decorative member, and method for manufacturing decorative member
EP3901227A1 (de) * 2015-12-23 2021-10-27 LG Hausys, Ltd. Tintenaufnahmeschichtzusammensetzung mit ausgezeichneten druckeigenschaften für dekoratives element, dekoratives element und verfahren zur herstellung eines dekorativen elements
CN108368364B (zh) * 2015-12-23 2021-11-16 乐金华奥斯有限公司 印刷特性优秀的装饰材料用油墨接受层组合物、装饰材料及装饰材料制备方法
US11433695B2 (en) 2015-12-23 2022-09-06 Lg Hausys, Ltd. Ink-receiving layer composition having excellent printing characteristics for decorative member, decorative member, and method for manufacturing decorative member
US11560007B2 (en) 2015-12-23 2023-01-24 Lg Hausys, Ltd. Ink-receiving layer composition having excellent printing characteristics for decorative member, decorative member, and method for manufacturing decorative member

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US20050202187A1 (en) 2005-09-15
KR20060043306A (ko) 2006-05-15
EP1571000B1 (de) 2007-01-10

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